diff -r 875fe3f689e0 -r d276e88aa48a lemon/utility.h
--- a/lemon/utility.h	Wed Mar 01 09:40:16 2006 +0000
+++ b/lemon/utility.h	Wed Mar 01 10:04:47 2006 +0000
@@ -68,21 +68,12 @@
     static const bool value = false;
   };
 
-  template <bool left, bool right>
-  struct _CompileTimeAnd {
-    static const bool value = false;
+
+  class InvalidType {
+  private:
+    InvalidType();
   };
   
-  template <>
-  struct _CompileTimeAnd<true, true> {
-    static const bool value = true;
-  };
-
-  template <typename Left, typename Right>
-  struct CompileTimeAnd {
-    static const bool value = 
-    _CompileTimeAnd<Left::value, Right::value>::value;
-  };
 
   template <typename T>
   struct Wrap {